Thanks for playing (and reporting back with how it went)! I would definitely like to expand it out further down the line. I have some notes for a proper campaign of missions (and I'd want to touch up and expand the rules a bit too). Sometime!
You're generally right on the Speed vs Armor front. You can tank by getting high numbers in both but Speed, with what's there now, is typically the optimal play. That's something I'd build another bonus around for Armor in a v2, for sure!